allomorph > define

noun

• Any of several different crystalline forms of the same chemical compound.
  • usage: "calcium carbonate occurs in the allomorphs calcite and aragonite"
• A variant phonological representation of a morpheme.
  • usage: "the final sounds of `bets' and `beds' and `horses' and `oxen' are allomorphs of the English plural morpheme"

• (n.) Any one of two or more distinct crystalline forms of the same substance; or the substance having such forms; -- as, carbonate of lime occurs in the allomorphs calcite and aragonite.
• (n.) A variety of pseudomorph which has undergone partial or complete change or substitution of material; -- thus limonite is frequently an allomorph after pyrite.